Question

A mutation exists in a gene that controls hair growth on the middle digit of human fingers. some people have mid-digital hair, while others do not. the gene can be passed from one generation to the next. which explanation best predicts what should happen to this trait over time?

Answer 1

These hairs are the mid-phalangeal hairs. This trait is called ad mid-digit hair and is not controlled by a single allele pair. Several studies have shown that these hairs are also controlled by environmental factors as well. The presence of such hair is a dominant trait, and thus, this trait will be passed on to the future generations also. The absence of hairs will be there if only both the recessive alleles are expressed and are environmentally favored also.

Answer 2

The incidence of mid-digital hair will not change because it offers no selective advantage or disadvantage.